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Add calibration routine from shell

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This commit is contained in:
Mario Hüttel
2020-02-15 17:53:15 +01:00
parent 5a00950589
commit c568b95cf2
8 changed files with 111 additions and 23 deletions
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95
stm-firmware/calibration.c
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@@ -19,9 +19,11 @@
#include <reflow-controller/calibration.h>
#include <reflow-controller/adc-meas.h>
#include <stm-periph/uart.h>
#include <helper-macros/helper-macros.h>
#include <arm_math.h>
#include <stdlib.h>
#include <float.h>
void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
float *sens_deviation, float *sens_corrected_offset)
@@ -44,23 +46,24 @@ void calibration_calculate(float low_measured, float low_setpoint, float high_me
int calibration_acquire_data(float *mu, float *sigma, uint32_t count)
int calibration_acquire_data(float *mu, float *max_dev, uint32_t count)
{
int status;
float *stream_mem;
float min_val = FLT_MAX;
float max_val = -FLT_MAX;
uint32_t i;
int ret_val = 0;
static volatile int flag = 0;
if (!mu || !sigma || !count)
if (!mu || !max_dev || !count)
return -1000;
stream_mem = (float *)calloc(count, sizeof(float));
if (!stream_mem)
return -2;
/* Clear errors of PT1000 reading */
adc_pt1000_clear_error();
status = adc_pt1000_stream_raw_value_to_memory(stream_mem, count, &flag);
if (status)
return status;
@@ -70,7 +73,8 @@ int calibration_acquire_data(float *mu, float *sigma, uint32_t count)
if (flag != 1) {
/* Error */
return -1;
ret_val = -1;
goto ret_free_mem;
}
/* Convert the stream memory to Ohm readings */
@@ -79,10 +83,87 @@ int calibration_acquire_data(float *mu, float *sigma, uint32_t count)
/* Do not compute std-deviation. Too imprecise
* arm_std_f32(stream_mem, count, sigma);
*/
*sigma = 0;
arm_mean_f32(stream_mem, count, mu);
/* Find min and max values of array */
for (i = 0U; i < count; i++) {
min_val = MIN(min_val, stream_mem[i]);
max_val = MAX(max_val, stream_mem[i]);
}
/* Compute maximum deviation range */
*max_dev = max_val - min_val;
ret_free_mem:
free(stream_mem);
return ret_val;
}
static void wait_for_uart_enter()
{
int enter_received = 0;
const char *recv_data;
size_t recv_len;
size_t iter;
int uart_recv_status;
do {
uart_recv_status = uart_receive_data_with_dma(&recv_data, &recv_len);
if (uart_recv_status >= 1) {
for (iter = 0; iter < recv_len; iter++) {
if (recv_data[iter] == '\n' || recv_data[iter] == '\r')
enter_received = 1;
}
}
} while (enter_received == 0);
}
int calibration_sequence_shell_cmd(shellmatta_handle_t shell)
{
float mu, mu2, dev, dev2;
float sens_dev, offset;
/* Clear errors of PT1000 reading */
adc_pt1000_clear_error();
shellmatta_printf(shell, "Starting calibration: Insert 1000 Ohm calibration resistor and press ENTER\r\n");
wait_for_uart_enter();
shellmatta_printf(shell, "Measurement...\r\n");
/* Clear errors of PT1000 reading */
adc_pt1000_clear_error();
calibration_acquire_data(&mu, &dev, 512UL);
shellmatta_printf(shell, "R=%.2f, Noise peak-peak: %.2f\r\n", mu, dev);
if (adc_pt1000_check_error() != ADC_PT1000_NO_ERR) {
shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
return -1;
}
/* Measure 2nd calibration point */
shellmatta_printf(shell, "Insert 2000 Ohm calibration resistor and press ENTER\r\n");
wait_for_uart_enter();
shellmatta_printf(shell, "Measurement...\r\n");
/* Clear errors of PT1000 reading */
adc_pt1000_clear_error();
calibration_acquire_data(&mu2, &dev2, 512UL);
shellmatta_printf(shell, "R=%.2f, Noise peak-peak: %.2f\r\n", mu2, dev2);
if (adc_pt1000_check_error() != ADC_PT1000_NO_ERR) {
shellmatta_printf(shell, "Error in resistance measurement: %d", adc_pt1000_check_error());
return -2;
}
/* Check noise values */
if (dev > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM || dev2 > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM) {
shellmatta_printf(shell, "Calibration failed! Too much noise. Check you're hardware.\r\n");
return -3;
}
/* Calculate calibration */
calibration_calculate(mu, 1000.0f, mu2, 2000.0f, &sens_dev, &offset);
shellmatta_printf(shell, "Calibration done:\r\n\tSENS_DEVIATION: %.4f\r\n\tOFFSET_CORR: %.2f\r\n", sens_dev, offset);
adc_pt1000_set_resistance_calibration(offset, sens_dev, true);
return 0;
}

3
stm-firmware/include/helper-macros/helper-macros.h
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@@ -11,4 +11,7 @@
#define COUNT_OF(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif /* __HELPER_MACROS_H__ */

7
stm-firmware/include/reflow-controller/calibration.h
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@@ -20,13 +20,16 @@
#ifndef __CALIBRATION_H__
#define __CALIBRATION_H__
#define CALIBRATION_MAX_STDDEV_OHM 1.0f
#define CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM 8.0f
#include <stdint.h>
#include <shellmatta.h>
void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
float *sens_deviation, float *sens_corrected_offset);
int calibration_acquire_data(float *mu, float *sigma, uint32_t count);
int calibration_acquire_data(float *mu, float *max_dev, uint32_t count);
int calibration_sequence_shell_cmd(shellmatta_handle_t shell);
#endif /* __CALIBRATION_H__ */

2
stm-firmware/include/stm-periph/dma-ring-buffer.h
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@@ -51,7 +51,7 @@ int dma_ring_buffer_periph_to_mem_initialize(struct dma_ring_buffer_to_mem *dma_
* @param[in] buff Ring buffer structure
* @param[out] data_buff Pointer to set to new data. This must not be modified!
* @param[out] len Length in elements
* @return 0 if successful (data, no data), -1 if error, and 1 if data with wrap around. Call function again in this case to retrieve rest after wrap around.
* @return 0 if successful, but no data), -1 if error, 1 if data, and 2 if data with wrap around. Call function again in this case to retrieve rest after wrap around.
*/
int dma_ring_buffer_periph_to_mem_get_data(struct dma_ring_buffer_to_mem *buff, const void **data_buff, size_t *len);

6
stm-firmware/main.c
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@@ -31,6 +31,7 @@ int main()
const char *uart_input;
size_t uart_input_len;
shellmatta_handle_t shell_handle;
int uart_receive_status;
setup_nvic_priorities();
systick_setup();
@@ -51,10 +52,9 @@ int main()
while(1) {
pt1000_value_status = adc_pt1000_get_current_resistance(&pt1000_value);
if (uart_receive_data_with_dma(&uart_input, &uart_input_len) >= 0) {
uart_receive_status = uart_receive_data_with_dma(&uart_input, &uart_input_len);
if (uart_receive_status >= 1)
shell_handle_input(shell_handle, uart_input, uart_input_len);
}
//systick_wait_ms(300);
}
}

16
stm-firmware/shell.c
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@@ -152,14 +152,14 @@ static shellmatta_retCode_t shell_cmd_uptime(const shellmatta_handle_t handle,
return SHELLMATTA_OK;
}
static shellmatta_retCode_t shell_cmd_acquire_val(const shellmatta_handle_t handle,
static shellmatta_retCode_t shell_cmd_cal(const shellmatta_handle_t handle,
const char *arguments,
uint32_t length)
{
float mu, sigma;
(void)arguments;
(void)length;
calibration_acquire_data(&mu, &sigma, 128U);
shellmatta_printf(handle, "mu: %.2f\r\nsigma: %.3f\r\n", mu, sigma);
calibration_sequence_shell_cmd(handle);
return SHELLMATTA_OK;
}
//typedef struct shellmatta_cmd
@@ -222,11 +222,11 @@ static shellmatta_cmd_t cmd[7] = {
.next = &cmd[6],
},
{
.cmd = "pt1000-acquire",
.cmdAlias = "ptac",
.helpText = "Acquire 128 samples",
.cmd = "calibrate",
.cmdAlias = "cal",
.helpText = "Calibrate resistance measurement",
.usageText = "",
.cmdFct = shell_cmd_acquire_val,
.cmdFct = shell_cmd_cal,
.next = NULL,
}
};

3
stm-firmware/stm-periph/dma-ring-buffer.c
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@@ -81,11 +81,12 @@ int dma_ring_buffer_periph_to_mem_get_data(struct dma_ring_buffer_to_mem *buff,
*data_buff = &(((char *)buff->data_ptr)[buff->get_idx * buff->element_size]);
*len = buff->buffer_count - buff->get_idx;
buff->get_idx = 0;
ret_code = 1;
ret_code = 2;
} else if (put_idx > buff->get_idx) {
*data_buff = &(((char *)buff->data_ptr)[buff->get_idx * buff->element_size]);
*len = put_idx - buff->get_idx;
buff->get_idx += *len;
ret_code = 1;
} else {
/* No new data */
*len = 0;

2
stm-firmware/syscalls.c
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@@ -67,6 +67,6 @@ int _read(void)
int _write(int fd, const void *buf, int count)
{
if (fd == 1)
uart_send_array((char*)buf, count);
uart_send_array_with_dma((char*)buf, count);
return count;
}